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Rating: 2
One of the FMCs is briefly fingered by another girl before (presumably) the start of a threesome with a guy.
Tax Girlfriend – Chapter 10
Tag: Male Involved
Scene has a male involved in some way from the beginning. (Whether it’s for a FFM Threesome or some other means.)
Chishojo Fuuki Iin no Minna ni Ienai Inbi na Onegai – Chapter 8 Scene 2
Series Page
Raw Chapter Link (Pages 23-65)
Rating: 3
The MC has another foursome with all 3 of the FMCs.
Darashina Sister – Chapter 7
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Rating: 5
The MC has a threesome with Maika and Uta.
Hate Modoru Isekai Tensei – Nankai Yatte mo Osananajimi ni Tadoritsukenai – Chapter 17
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Rating: 1
The MC has an orgy with the girls in his harem.
Sticky Lovers – Chapter 1
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Raw Chapter Link (Pages 5-32)
Rating: 3
The MC of the chapter has a threesome with both of the FMCs.
Oshare Maruhi Sensei – Chapter 7
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Rating: 4
During a foursome with 2 other guys, the FMC has lesbian sex with another girl.
One Girl a Day – Chapter 21
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Rating: 4
The MC has a threesome with 2 of the FMC’s.
Joshi OtaCir no Ouji-sama – Chapter 7
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Raw Chapter Link (Page 179)
Rating: 4
The MC has an orgy with all 4 of the girls in the club and their advisor/teacher.
At one point, a few of the girls briefly break off to have lesbian sex with each other, but they quickly invite the MC back in.
This chapter has an official translation that you’ll have to look around to find.
Sex! Story – Chapters 15-17
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Rating: 2
The MC has another threesome with both of the FMC’s.
Ukkari Haicchatta! Itoko to Micchaku Game Chuu – Chapters 33-34
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Raw Chapter Links: Ch. 33 – Ch. 34
Rating: 3
Matsuri and the MC grope Sayaka while they’re at a Karaoke place.
The scene progresses into a threesome.